Creates the Digital Age Assurance Act. Provides that an operating system provider shall: (1) provide an accessible interface at account setup that requires an account holder to indicate the birth date or age of the user of that device for the purpose of providing a signal regarding the user's age bracket to applications available in a covered application store; and (2) provide a developer who has requested a signal with respect to a particular user with a digital signal by a reasonably consistent real-time application programming interface that identifies, at a minimum, which age bracket pertains to the user. Provides that a developer that receives a signal in accordance with the Act shall be deemed to have actual knowledge of the age range of the user to whom that signal pertains across all platforms of the application and points of access of the application. Limits the use of data collected under the Act. Provides that a person that violates the Act shall be subject to an injunction and a specified civil penalty. Sets forth provisions concerning nondiscrimination and the scope of the Act. Effective January 1, 2027.